One of the biggest revelations of the Pandaemonium story this patch was the existence of Ultima, the High Seraph long before the sundering occurred. She's the one who much of the troubles of auracite originate from, and I think her role has greatly graduated from just a final Alliance Raid boss to a true threat whose implications reach further than we may have thought.
Just one issue, if Ultima was present during the unsundered world, what came of her following the sundering? Was she simply sundered into 14 shards with the rest of Etheirys, or did she leave beforehand?
Going off the timeline of events, Ultima visited Etheriys and whether directly or not gave the Heart of Sabik to Athena. Following the sundering, no information is known until Saint Ajora would "summon" her in a bid to destroy the Holy Ydoran Empire. It's implied the other Zodiac Braves didn't quite agree with this method, and worked in some capacity with the Mothercrystal to seal Ultima away. Her legend would spread throughout mankind, and soon people would begin to worship her "feeding the extradimensional traveler's empty soul until it brimmed with a force completely alien to Her— a sense of self".
She was claimed to be a vessel of pure ruination, but through prayer and worship gained a sense of self.. If Athena did somehow directly gain the auracite from Ultima, it'd go directly against the idea that she is just ruination incarnate.
What it sounds like, to me, is that there's one of two things going on.
A) Ultima's pure ruination visited Eitherys, dropped off some auracite that Athena managed to find, and either fled / remained during the Sundering. She was then somehow summoned by Saint Ajora, and then through fear of her legend grew into a self-aware entity.
Or B) The Ultima that visited Eitherys pre-sundering and the Ultima Saint Ajora summoned are two separate entities, with the latter being a primal that became self-aware through devotion (see the Light of Klitia or Sect of Germonique).
Option B, if true, would imply that the real High Seraph is still somewhere out there. Whether in the cosmos, or hiding somewhere within the star, she appears to be a force to be reckoned with.
The only problem with Option B is the existence of her primal-auracite still holding the capabilities of things such as the Heart of Sabik. If it's not the genuine thing, should it even still work? Can a primal produce materiel like that?
Although I doubt this was the original plan, her being tied back to the Heart of Sabik does leave open the possibility of her influence being seen again, what with the Heart now being actively researched. The possibility of her returning in future content, potentially even MSQ given the current lead writer's history with Matsuno, seems likely.
I'm very curious what others might think of these points, or if there are some insights I'm missing. This may just be a nice way to tie back old plot threads, but perhaps there's more to it?